我有一个自定义的图像控件,它像这样呈现
<img id="2344324_Img" />
我正在这样访问HTML 5 canvas对象中的图像:
var imgOne = new Image();
imgOne = document.getElementById('2344324_Img');
imgOne.onload = function() {
// ..some code
canvas.drawImage(this, 20, 20);
};
这是正确的方法吗?
最佳答案
如果您的标记中已经包含<img>
标记并打算通过getElementById()
访问它,则无需调用new Image()
:
<img id="2344324_Img"/>
<script type='text/javascript'>
// Don't need this...
//var imgOne = new Image();
// Instead just do:
var imgOne = document.getElementById('2344324_Img');
imgOne.onload = function() {
..some code
canvas.drawImage(this, 20, 20);
// Should be accessible either via `this` or `imgOne`
//canvas.drawImage(imgOne, 20, 20);
}
</script>